No you ok.
I just learning about mid tones too. I just got a book on John Singer Sargent who is one of the great portrait painters of the 1800's . he say to study Fran Hals and Diego Velazquez to learn portrait painting. He also study under Carolus Duran who emphasized schemes and the importances of color values and halftones. Sargent abilities soon supersede those of his mater Duran but he had respect for him all his life.
I been just painting for two and a halve years and am 61 years old. I just learning too .
I googled john Sargent technique and read how he did it. In other words I almost self teach so I do not know that much also. I just do what I do and learning as I go. I some how got into a gallery where the members vote you in. I know some people did not get in. i did some how because they like my work. your work is more refine that mine. i a simple painter and I know it realistic that lends an existence of surrealism as the gallery I joined would tell me .
I see you doing your best to get more realistic in your painting. So do like Sargent did and study the men he studied. I know I will. I like your work and keep it up by all means.
I know when i started I had a house painting expert behind me as that what I did as a living but I had to retire early because of bad knees. maybe that what help me to start painting and be as good as i am. Plus i pray and ask the Lord to help me too that a big help as I believe He do help me.
I telling you this to show where i comeing from.
Oh this site do have a treat you may like on John Sargent. it good
I was going to go to college but I talk to two people and they say the college here is not too good for teaching what you need to know about art. Do not even teach color theory so i had to go on the web and be self teach on that too. just teach you the basic and then you on your own. they motivate you and that all. I got as many ideas as the stars you see when you look up at the night sky. just pick one and do it.
I had to google halftones just to learn what that is
and values also
still thinking about that one